I highly recommend MeetUp. It is not a dating or matchmaking site, it is an activities site--groups of every conceivable type post their meetings and let you join their groups and sign up for events. And there are groups everywhere.

I was about to spend my first Christmas alone in twenty five years, and I was desperately looking for somewhere to go. I found meetup, and on Christmas day, I was hiking with about 30 other people. A bunch of us went out to dinner afterwards, too. And if you can cover Christmas, everything else is easy...